Black and white

Critical question towards the intersectionalists and Identity Politics fanatics: What do you actually mean if you talk about "white"? Which kind of people are all included in this?
Is it only Central Europeans? Do people from Asia fall into the same category for you too?
What about Eastern Europeans or Russians? Or about Italians, Spaniards, Greeks?
Does "white" mean "all non-black people" - or is it the title only for a particular group of people (among "whites")?

And, if talking about "black" - what are you thinking of in that point? Does this include only sub-Saharan Africans - or also people with a comparable dark skin tone (like e. g. Cubans)?
Or is everyone automatically "black" if he cannot fit the category "white"? If his skin tone is too dark for that?